It's amazing that even though I have so many problems with Matt Smith's era, I still cry when he says goodbye. He's so magnificent in this role, capable of flying between grief and joy in mere seconds. Is it a little frustrating how Moffat keeps setting up bigger and bigger questions only to sidestep them and tell us that they never mattered anyway? Yes. But putting The Doctor on a planet called Christmas for hundreds of years to defend a small village from every alien he's ever faced is the perfect send off for Eleven.